Charles Perkins Centre, Prevention Research Collaboration, Faculty of Health and Medicine, Sydney School of Public Health, The University of Sydney, Sydney, New South Wales, Australia. NHMRC Centre of Research Excellence in the Early Prevention of Obesity in Childhood, Sydney, New South Wales, Australia. Menzies Centre, Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia. Boden Institute, Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia. Global Obesity Centre, Deakin University, Geelong, Victoria, Australia. College of Nursing and Health Sciences, Flinders University, Adelaide, South Australia, Australia. Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Burwood, Victoria, Australia. Health Promotion Unit, Sydney Local Health District, Sydney, New South Wales, Australia. Office of Preventive Health, New South Wales Ministry of Health, Sydney, New South Wales, Australia.